void ReplaceString(std::string &s, const std::string &src, const std::string &dst)
{
    std::string::size_type pos = 0;
    std::string::size_type srcLen = src.size();
    std::string::size_type dstLen = dst.size();
    while ((pos = s.find(src, pos)) != std::string::npos)
    {
        s.replace(pos, srcLen, dst);
        pos += dstLen;
    }
}
